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A process for obtaining molten iron and matte phase by one-step reduction of metallurgical composite slag

A technology for compounding slag and molten iron, applied in the fields of iron and steel metallurgy and non-ferrous metallurgy, can solve problems such as separation difficulties, achieve broad application prospects, change the status quo of utilization, and achieve considerable economic and social benefits.

Active Publication Date: 2016-08-24
CENT IRON & STEEL RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, reduction melting method is still the most effective method to deal with copper slag, but almost all copper enters molten iron to form copper-iron alloy, and it is difficult to separate the two

Method used

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  • A process for obtaining molten iron and matte phase by one-step reduction of metallurgical composite slag
  • A process for obtaining molten iron and matte phase by one-step reduction of metallurgical composite slag
  • A process for obtaining molten iron and matte phase by one-step reduction of metallurgical composite slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The water-quenched copper slag in Yunnan has a TFe content of 40.57%, a copper content of 0.75%, and a natural alkalinity of 0.15. Grind copper slag to a powder with a particle size of less than 0.125 mm, add a certain amount of lime and coal powder and mix well to prepare carbon-containing pellets with an alkalinity of 1.0. The prepared carbon-containing pellets were dried in an oven at 200°C for 4 hours, and then put into a tubular resistance furnace at 1400°C and kept in a graphite crucible for 40mins for melting. Weigh the mass of granular iron obtained after melting to determine the yield of iron, and determine the copper content of the sample through chemical titration analysis. The analysis results show that when the alkalinity is 1.0, the yield of iron increases with the prolongation of the holding time, and the yield reaches 91% at 40 mins. %, the removal rate of copper in molten iron is close to 80%.

Embodiment 2

[0033] Jiangyin copper slag has a TFe content of 42.94%, a copper content of 0.69%, and a natural alkalinity of 0.07. Grind Jiangxi copper slag to a powder with a particle size of less than 0.125 mm, add a certain amount of lime and coal powder and mix well to prepare carbon-containing pellets. The prepared carbon-containing pellets were dried in an oven at 200°C for 4 hours, and then put into a tubular resistance furnace at 1400°C and kept in a graphite crucible for 40mins for melting. Weigh the mass of granular iron obtained after melting to determine the yield of iron, and determine the copper content of the sample through chemical titration analysis. The analysis results show that when the alkalinity is 1.0, the yield of iron is 92.3%, the content of granular iron and copper is reduced to 0.38%, and the removal rate of copper in molten iron exceeds 75%.

Embodiment 3

[0035] Jinchang high-nickel slag has a TFe content of 32.97%, a nickel content of 0.639%, and a natural alkalinity of 0.59. Grind copper slag to a powder with a particle size of less than 0.125 mm, add a certain amount of lime and coal powder and mix to prepare carbon-containing pellets. The prepared carbon-containing pellets were dried in an oven at 200°C for 4 hours, and then put into a tubular resistance furnace at 1400°C and kept in a graphite crucible for 40mins for melting. Weigh the mass of granular iron obtained after melting to determine the yield of iron, and determine the nickel content of the sample through chemical titration analysis. The analysis results show that when the basicity is 1.0, the yield of iron is 88%, the content of granular iron and nickel is reduced to 0.21%, and the removal rate of nickel in molten iron is 85%.

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Abstract

The invention discloses a process for one-step reduction of metallurgical composite slag to obtain molten iron and a matte phase, belongs to the technical fields of ferrous metallurgy and non-ferrous metallurgy, and relates to a technology for separating and recovering iron and nonferrous metals of metallurgical composite slag in a reducing melting process. The process comprises the following steps: levigating metallurgical composite slag and then feeding lime and a carbonaceous reducing agent to prepare a carbon-containing pellet; directly restoring the carbon-containing pellet and then achieving slag-matte-iron three-phase layering in a melting furnace; and respectively recovering iron and nonferrous metals. The process is capable of achieving separation of iron and nonferrous metals, and gathering the nonferrous metals into the matte phase to play a comprehensive recovery role in a plurality of metal elements; a serious environment problem is caused by stacking of the metallurgical slag, and great waste of resources is also caused, so that the current situation of utilization of the metallurgical slag is greatly changed by the process; considerable economic benefits and social benefits are generated; and the process has a wide application prospect.

Description

technical field [0001] The invention belongs to the technical fields of iron and steel metallurgy and nonferrous metallurgy, and in particular relates to a process for obtaining molten iron and matte phases by one-step reduction of metallurgical composite slag, so as to comprehensively recycle metal elements in metallurgical composite slag, especially iron and nonferrous metals copper and nickel Reduction and separation recovery. technical background [0002] Pyrometallurgy is the most important method of copper metallurgy. Its copper output accounts for 80% of the total copper output, and even reaches 97% in China. The copper slag output per ton of copper is about 2.2t, and the amount of slag is huge. The grades of copper slag, iron and copper are 30%-40% and 0.5%-2%, respectively, which have high recycling value. The iron grade of nickel slag is equivalent to that of copper slag, and it also contains 0.2% to 0.7% nickel. [0003] The utilization methods of copper slag ma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/04C22B5/10C22B15/00C22B23/02C21B15/00
CPCY02P10/20
Inventor 张俊齐渊洪严定鎏程相利
Owner CENT IRON & STEEL RES INST
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